Donald Trump in the White House

Cohen, whose Manhattan office, home and hotel room were raided earlier this month by the FBI, has not been charged with any crimes.

Investigators are reportedly looking at payments Cohen made to women claiming to have had affairs with Trump and other business he has been involved in. He could face bank fraud or campaign finance charges.

Cohen, whose Manhattan office, home and hotel room were raided earlier this month by the FBI, has not been charged with any crimes. (Pablo Martinez Monsivais/AP)

Over the weekend, Trump tweeted that he doubts his longtime "fixer" would flip and cooperate with investigators.

Trump wrote that The New York Times and reporter Maggie Haberman were "going out of their way to destroy Michael Cohen and his relationship with me in the hope that he will 'flip.'"